Replace your Keurig water filter every two months or when water flow slows
A Keurig water filter sits inside the water reservoir and catches sediment, chlorine, and other particles before they reach the brewing chamber. Over time it clogs and water flows more slowly through the machine. Replacing it takes about five minutes and costs between $8 and $15 per filter, depending on the model.
Most Keurig owners replace filters every two months with regular use, though this varies based on your tap water quality and how often you brew. If you notice the brew cycle taking longer than usual, or if your coffee tastes like tap water instead of coffee, the filter is likely due for replacement.
The exact steps depend on your Keurig model, but the process is the same across all machines: remove the old filter from the reservoir, rinse the reservoir, insert the new filter, and run water through the system before brewing. You do not need tools or special knowledge.
Key Takeaways
- Keurig filters sit inside the water reservoir and should be replaced every two months or when water flow noticeably slows.
- The replacement process takes about five minutes and requires only the new filter cartridge and access to your sink.
- You must soak the new filter in cold water for fifteen minutes before inserting it, or it will not filter properly.
- After installing a new filter, run a full reservoir of water through the machine without a K-Cup to flush the system.
What you need before you start
Gather a replacement filter cartridge that matches your Keurig model. Keurig sells filters under the name Keurig Water Filter Cartridge or Keurig Charcoal Filter. Check your machine's manual or the Keurig website to confirm which cartridge fits your model—there are different sizes for different reservoir designs.
You will also need a bowl or cup of cold water to soak the new filter. Have your sink nearby so you can rinse the reservoir and run water through the machine. No other tools or supplies are required.
How to remove the old filter
Open the top of your Keurig and lift out the water reservoir. The old filter cartridge sits inside the reservoir, usually held in place by a clip or bracket at the bottom. Grasp the filter firmly and pull it straight down and out of the reservoir.
Empty any remaining water from the reservoir into the sink. Rinse the inside of the reservoir thoroughly with cold water, paying attention to the area where the filter sat. This removes sediment and debris that may have accumulated.
Prepare and install the new filter
Place the new filter cartridge in a bowl of cold water and let it soak for fifteen minutes. This step is important—soaking activates the charcoal inside the filter so it can trap contaminants. If you skip this step, the filter will not work properly for the first few brews.
After soaking, insert the filter into the reservoir with the clip or bracket facing down. Push it firmly into place until you hear or feel it click or seat fully. The filter should not wiggle or move when you gently tug it.
Fill the reservoir with cold water and place it back into the machine. Close the top of the Keurig.
Flush the system before brewing
Run a full reservoir of water through the machine without inserting a K-Cup. Place a large mug or pitcher under the brew head to catch the water. Press the brew button and let the water flow until the reservoir is empty. This flushes the new filter and removes any loose charcoal particles.
Refill the reservoir with fresh water and repeat the flush one more time. After the second flush, your Keurig is ready to brew normally. The first cup of coffee may taste slightly different as the filter settles in, but this is normal.
When to replace your filter
Most Keurig owners replace filters every two months with daily use. If you brew only a few times per week, filters may last three to four months. If you have very hard tap water or live in an area with high sediment, you may need to replace filters more frequently.
The clearest sign that a filter needs replacement is slower water flow. If your brew cycle takes noticeably longer than it used to, or if water barely trickles through, the filter is clogged. Some newer Keurig models have a filter indicator light that reminds you when replacement is due—check your manual to see if yours has this feature.
Troubleshooting common filter problems
If water still flows slowly after you install a new filter, make sure you soaked it for the full fifteen minutes. A dry filter can restrict water flow. Remove the filter, soak it again, and reinstall it. If flow is still slow, the reservoir itself may be clogged with mineral buildup—run a descaling cycle using a Keurig descaling solution according to your machine's manual.
If your coffee tastes like tap water even with a new filter, the filter may not be seated properly in the reservoir. Remove it and check that the clip or bracket is fully engaged. Reinstall and run another flush cycle. If the problem persists, the filter cartridge itself may be defective—contact Keurig support or try a different brand of compatible filter.
Frequently Asked Questions
Can I use a Keurig without a water filter?
Yes, but it is not recommended. Without a filter, sediment and chlorine reach the brewing chamber and can affect the taste of your coffee. Mineral buildup also accumulates faster inside the machine, which can damage internal parts over time. A filter costs $8 to $15 and lasts two months, so the cost is minimal compared to potential repair bills.
What happens if I forget to soak the new filter?
The filter will still work, but it may restrict water flow for the first few brews until it absorbs water naturally. Soaking for fifteen minutes before installation activates the charcoal and ensures full performance from the start. If you forgot to soak, straightforward remove the filter, soak it now, and reinstall it.
Are third-party water filters compatible with Keurig machines?
Many third-party filters work in Keurig machines, but check the product description to confirm compatibility with your specific model. Some generic charcoal filters fit certain Keurig reservoirs but not others. Keurig brand filters are may provide to fit, though they cost slightly more than some alternatives.
How do I know which filter size my Keurig needs?
Check your machine's manual or visit the Keurig website and enter your model number. The manual will specify the correct filter cartridge. You can also measure the diameter of the old filter before you remove it, or contact Keurig customer service with your model number and they will tell you which filter to order.